Update doc

Author: jcs090218

README.md

@@ -1,2 +1,22 @@
 # shader-language-server
-Language server implementation for ShaderLab
+> Language server implementation for ShaderLab
+
+## 🚧 Status
+
+Still in development.
+
+#### Current Features
+
+- Completion
+
+#### Planned Features
+
+- Diagnostics
+- Hover
+- Jump to def
+
+## 🔨 Usage
+
+```sh
+/path/to/ShaderLS --stdio
+```